//
//  NetworkTools.swift
//  weibo
//
//  Created by huangtuo on 16/6/5.
//  Copyright © 2016年 huangtuo. All rights reserved.
//

import UIKit
import AFNetworking

/// HTTP 请求方法枚举
enum HMRequestMethod: String {
    case GET = "GET"
    case POST = "POST"
}

class NetworkTools: AFHTTPSessionManager {
    
    // MARK: - 应用程序信息
    private let appKey = "2911783605"
    private let appSecret = "dd537c5565e06295876d815ab2e2aab2"
    private let redirectUrl = "http://www.baidu.com"
    
    /// 网络请求完成回调，类似于 OC 的 typeDefine
    typealias HMRequestCallBack = (result: AnyObject?, error: NSError?)->()
    
    // 单例
    static let sharedTools: NetworkTools = {
        
        let tools = NetworkTools(baseURL: nil)
        
        // 设置反序列化数据格式 - 系统会自动将 OC 框架中的 NSSet 转换成 Set
        tools.responseSerializer.acceptableContentTypes?.insert("text/plain")
        
        return tools
    }()
}

// MARK: - OAuth 相关方法
extension NetworkTools {
    
    /// OAuth 授权 URL
    /// - see: [http://open.weibo.com/wiki/Oauth2/authorize](http://open.weibo.com/wiki/Oauth2/authorize)
    var oauthURL: NSURL {
        
        let urlString = "https://api.weibo.com/oauth2/authorize?client_id=\(appKey)&redirect_uri=\(redirectUrl)"
        
        return NSURL(string: urlString)!
    }
    
    /// 加载 AccessToken
    func loadAccessToken(code: String, finished: HMRequestCallBack) {
        
        let urlString = "https://api.weibo.com/oauth2/access_token"
        
        let params = ["client_id": appKey,
            "client_secret": appSecret,
            "grant_type": "authorization_code",
            "code": code,
            "redirect_uri": redirectUrl]
        
        request(.POST, URLString: urlString, parameters: params, finished: finished)
    }
    
}

// MARK: - 封装 AFN 网络方法
extension NetworkTools {
    
    /// 网络请求
    ///
    /// - parameter method:     GET / POST
    /// - parameter URLString:  URLString
    /// - parameter parameters: 参数字典
    /// - parameter finished:   完成回调
    private func request(method: HMRequestMethod, URLString: String, parameters: [String: AnyObject]?, finished: HMRequestCallBack) {
        
        // 定义成功回调
        let success = { (task: NSURLSessionDataTask, result: AnyObject?) -> Void in
            finished(result: result, error: nil)
        }
        
        // 定义失败回调
        let failure = { (task: NSURLSessionDataTask?, error: NSError) -> Void in
            // 在开发网络应用的时候，错误不要提示给用户，但是错误一定要输出！
            print(error)
            finished(result: nil, error: error)
        }
        
        if method == HMRequestMethod.GET {
            
            GET(URLString, parameters: parameters, progress: nil, success: success, failure: failure)
            
        } else {
            POST(URLString, parameters: parameters, progress:nil, success: success, failure: failure)
        }
        
    }
}

















